confusedyid
Wolf said it very well. It has to be a good fit for your child.
Take into account things like class size and individualized attention, are the Rabbeim known to be open and friendly, do they get a kesher with the boys? What kind of boys go there? Are they cliquey or snobby or more accepting…?
See if you can talk to boys who went to the school recently or are currently there that will give you tons of insights.